Biology 546
Human parasitology laboratory tutorial

The larvae on the left was passed in the stool of a 48 year old Vietnam veteran. It measured about 300 micrometers in length. Many other identical larvae were also present, and even a few elongate, slender female worms measuring about 2.5 mm in length were noted. What species does it represent?

Ascaris lumbricoides
Enterobius vermicularis
Necator americanus
Strongyloides stercoralis

Original; photograph by S. J. Upton

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Kansas State University | Biology Division